How to avoid session timeout in asp.net

How do I in Javascript manage the session timeout problem of an asp.net app? The hosting company (WebHost4Life) has set a standard session timeout of 90 sec (!!!???) which I am not allowed to override in my web.config file!
I have included an asp:timer control in an updatepanel (in the master page) which keeps the app alive.
But I get a problem, because I have several updatepanels elsewhere in the app and theese updatepanels (which has updatemode=always) should not be refreshed every time I initiate the session timeout handling (each minute!).
I have seen some javascripts that are said to keep the app alive, but I cannot get them to work

as this is a common issue there should be plenty of examples on the web
http://www.codeproject.com/KB/session/Reconnect.aspx
(something similar to above lol but in code) http://gchandra.wordpress.com/2007/11/26/prevent-session-timeout-in-aspnet/

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